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soc: samsung: usi: add a routine for unconfiguring the ip

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Add a devm_add_action_or_reset() routine for unconfiguring the USI IP
block whenever the device gets removed.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Link: https://lore.kernel.org/r/20250204172803.3425496-3-ivo.ivanov.ivanov1@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
This commit is contained in:
Ivaylo Ivanov 2025-02-04 19:28:01 +02:00 committed by Krzysztof Kozlowski
parent 648d2852ea
commit 11e77776b5
1 changed files with 28 additions and 0 deletions
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28
drivers/soc/samsung/exynos-usi.c
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@ -174,6 +174,30 @@ static int exynos_usi_configure(struct exynos_usi *usi)
return 0;
}
static void exynos_usi_unconfigure(void *data)
{
struct exynos_usi *usi = data;
u32 val;
int ret;
ret = clk_bulk_prepare_enable(usi->data->num_clks, usi->clks);
if (ret)
return;
/* Make sure that we've stopped providing the clock to USI IP */
val = readl(usi->regs + USI_OPTION);
val &= ~USI_OPTION_CLKREQ_ON;
val |= ~USI_OPTION_CLKSTOP_ON;
writel(val, usi->regs + USI_OPTION);
/* Set USI block state to reset */
val = readl(usi->regs + USI_CON);
val |= USI_CON_RESET;
writel(val, usi->regs + USI_CON);
clk_bulk_disable_unprepare(usi->data->num_clks, usi->clks);
}
static int exynos_usi_parse_dt(struct device_node *np, struct exynos_usi *usi)
{
int ret;
@ -251,6 +275,10 @@ static int exynos_usi_probe(struct platform_device *pdev)
if (ret)
return ret;
ret = devm_add_action_or_reset(&pdev->dev, exynos_usi_unconfigure, usi);
if (ret)
return ret;
/* Make it possible to embed protocol nodes into USI np */
return of_platform_populate(np, NULL, NULL, dev);
}